Otolith chemistry delineates the influence of natal origin, dispersal and flow on the population dynamics of golden perch (Macquaria ambigua) in a regulated river
Brenton P. Zampatti
A B I , Sandra J. Leigh A B , Phillipa J. Wilson A C , David A. Crook D E , Bronwyn M. Gillanders B , Roland Maas F , Jed I. Macdonald G H and Jon Woodhead F
+ Author Affiliations
- Author Affiliations
A Inland Waters and Catchment Ecology Program, South Australian Research and Development Institute (SARDI) – Aquatic Sciences, PO Box 120, Henley Beach, SA 5022, Australia.
B School of Biological Sciences, The University of Adelaide, Adelaide, SA 5005, Australia.
C Australian Institute of Marine Science, Indian Ocean Marine Research Centre, The University of Western Australia (M096), Perth, WA 6009, Australia.
D Research Institute for the Environment and Livelihoods, Engineering Health Science & Environment, Charles Darwin University, Darwin, NT 0909, Australia.
E Centre for Freshwater Ecosystems, La Trobe University, Wodonga, Vic. 3689, Australia.
F School of Geography, Earth and Atmospheric Sciences, The University of Melbourne, Parkville, Vic. 3010, Australia.
G Arthur Rylah Institute for Environmental Research, 123 Brown Street, Heidelberg, Vic. 3084, Australia.
H Oceanic Fisheries Programme, Pacific Community (SPC), BP D5 98848, Nouméa, New Caledonia.
I Corresponding author. Present address: CSIRO Land and Water, Locked Bag 2, Glen Osmond, SA 5064, Australia. Email: brenton.zampatti@csiro.au
Marine and Freshwater Research - https://doi.org/10.1071/MF20280
Submitted: 20 September 2020 Accepted: 27 April 2021 Published online: 29 June 2021
Journal Compilation © CSIRO 2021 Open Access CC BY-NC-ND
Abstract
For riverine fishes threatened by fragmentation and flow modification, effective management requires an understanding of when and where key life history processes (spawning, recruitment and movement) take place. The structural and chemical properties of otoliths provide a unique means to recount a fish’s life in time and space. We investigated the age structure of the migratory, pelagic-spawning golden perch (Macquaria ambigua) in the Murray River, Australia, and used water and otolith 87Sr/86Sr ratios to delineate the natal origin and movement of fish from discrete cohorts. Water 87Sr/86Sr was distinct among the Darling River (a major tributary) and lower and mid-Murray River. Otolith chemistry revealed golden perch collected in the lower Murray River were progeny of spawning in either the Murray or Darling rivers, during years characterised by within-channel rises in flow, or in both rivers in a year of overbank flooding. Movement of juvenile fish from the Darling River substantially influenced population structure in the lower Murray River, whereby post-flood population growth was largely due to the immigration of age-1+ fish. This study demonstrates the potential importance of tributary recruitment sources, dispersal and connectivity on main-stem population dynamics and the utility of otolith chemistry for spatially reconciling population structure and the life histories of freshwater fishes.
Keywords: freshwater fish, Murray–Darling Basin, migration, river regulation, strontium.
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